User Manual

Hydraulic System UNIWRAP TIC
56 UNI-h-Kap4 11/04
Description of function:
No volume flow flowing,
the solenoid valves are not
actuated.
Due to the two pressure springs located at the face end, spool (1) is
positioned so (see figure) that port P is shut off.
Ports A and B are sealed by the non-return valves.
Raise tipping cradle Solenoid coil (Y136) is actuated by the UNIWRAP electronics module and
moves spool (1) to the left.
Volume flow flows from channel P via the spool gap in front of the lock-up
valve unit non-return valve (734-1). Pressure is built up which:
- opens the lock-up valve unit non-return valve (734-1) and
- moves the piston (4) to the right.
The volume flow flows from port A via the open lock-up valve unit non-
return valve (734-1) into the rod spaces of the hydraulic cylinders - the
tipping cradle is raised.
At the same time, the piston (4) is moved to the right and opens the lock-
up valve unit non-return valve (734-2). Port B (piston spaces of hydraulic
cylinders) is connected with the tank (T1) via the open lock-up valve unit
non-return valve (734-2) and spool (1).
Lower tipping cradle Solenoid coil (Y135) is actuated by the UNIWRAP electronics module and
moves spool (1) to the right.
Volume flow flows from channel P via the spool gap in front of the lock-up
valve unit non-return valve (734-2). Pressure is built up which:
- opens the lock-up valve unit non-return valve (734-2) and
- moves the piston (4) to the left.
The volume flow from port B flows via the open lock-up valve unit non-
return valve (734-2) into the piston spaces of the hydraulic cylinders - the
tipping cradle is lowered.
At the same time, the piston (4) is moved to the left and opens the lock-
up valve unit non-return valve (734-1). Port A (rod spaces of the hydraulic
cylinders) is connected with the tank (T) via the open lock-up valve unit
non-return valve (734-1) and spool (1).